Rate: pressure, surface area (AQA GCSE Chemistry Combined Science): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What increases when a solid reactant is broken into smaller pieces?
What increases when a solid reactant is broken into smaller pieces?
Surface area to volume ratio
What is the surface area to volume ratio of 8 small cubes compared to 1 large cube?
What is the surface area to volume ratio of 8 small cubes compared to 1 large cube?
6 for small cubes, 3 for large cube
Why do smaller pieces of solid react faster than larger pieces?
Why do smaller pieces of solid react faster than larger pieces?
More surface area exposed for collisions
How much faster can powdered substances react compared to large lumps?
How much faster can powdered substances react compared to large lumps?
Hundreds of times faster
Which state of matter is most affected by pressure changes in reaction rate?
Which state of matter is most affected by pressure changes in reaction rate?
Gases
What happens to gas molecules at low pressure?
What happens to gas molecules at low pressure?
They are spread out
What is the effect of increasing pressure on a gas reaction rate?
What is the effect of increasing pressure on a gas reaction rate?
Reaction rate increases
What happens to collision frequency when pressure is doubled?
What happens to collision frequency when pressure is doubled?
Collision frequency doubles
What is directly proportional to both pressure and reaction rate?
What is directly proportional to both pressure and reaction rate?
Collision frequency
In the marble chips experiment, what happens with smaller chips?
In the marble chips experiment, what happens with smaller chips?
Gas is produced faster
In , what if there are 3 times as many molecules in same volume?
In , what if there are 3 times as many molecules in same volume?
Three times more collisions occur
What theory explains both surface area and pressure effects on reaction rate?
What theory explains both surface area and pressure effects on reaction rate?
Collision theory